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Regex.IsMatch(s, @"(?<w1>\w)(\k<w1>){2}:(?<w2>\w)(\k<w2>){2}");
String str = "111:222";
Regex reg = new Regex(@"(\d)\1\1:(\d)\2\2");
if (reg.IsMatch(str))
Console.WriteLine("ok");
else
Console.WriteLine("no");